pervious sand gravel透水: permeable; pervious to water砂砾: land waste; gravel; granule; ...层: I storey; tier; stratum含水砂砾层: running measure透水砂砾石层: pervious sand gravel下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:透水砂砾层，即可在微信中查询翻译
